Furnace



Dec. 17, 1929. G. A. KoHou'r 1,739,907

rumuncs I Filed Aug. 22. 1925 5 Sheets-Sheet 1 @www Dec. 17, 1929. s. A.Kol-lou'r 1,739,907

FURNACE med Aug. 22, 1925 5 sheets-sheet 2 FURNACE y Filed Aug. 22, 19255 Sheets-Sheet 3 y @MHz/72554 Dec. 17, 1929; e. A. KoHou'r FURNAQE FiledAug. 22, 1925 5 Sheets-Sheet 4 Dec. 17, 1929. G. A. KoHouT FURNACE FiledAug. 22. 1925 5 Sheets-Sheet 5 Patented Dec, 17, 1929 GEORGE A. KOHOUT,OF CHICAGO, ILLINOIS i FURNACE Application inea August 22, 1525,. SerialNo. 51,835.

My invention relates to furnaces and more particularly t-o a furnaceprovided with a hopper from which a stoker is adapted to convey fuelthrough theV combustion chamber.

It is a purpose of my invention to provide a furnace that isprovidedwith an internal hopper and a combustion chamber and which isprovided with means for conveying fuel from the hopper to the combustionchamber under a wall that divides the furnace into the hopper and acombustion chamber.

In my application, Serial No. 37,136, filed June l5, 1925, I set forth afurnace having` these above set forthk general characteristics.

- My present invention is an improvement upon a furnace such as aboveset forth in that I provide additional means for baffling or directingthe flow of a certain portion of the gases in such a manner as to leadto more thorough and complete combustion. e

I will describe various forms which my invention may take by referringto the accompanying drawings in which- Fig. l is a longitudinalsectional view of a portion of a furnace and the adjoining portions of aboiler embodying my invention;

Fig. 2 is a similar kind of view of a fire boX boiler embodying amodified form of my invention;

Fig. 3 is a similar view of a return tubular boiler showing my improvedinvention;

Fig. 4 is a similar view of a return tubular boiler showing a modifiedform of my invention;

Fig. 5 is a fragmentary sectional view on line 5-5 of Fig, 4;

6 is a view similar to Fig.-2 of a modified form of my invention; and

Fig. 7 is a fragmentary section on line 7 of Fig. 6.

Referring more particularly to Fig. l, I show a furnace having a frontwall 20, a boiler 2l, a bridge wall 22 and an ash pit 23. The boiler hasa crown sheet 24 which completes the fire box. vA 'stoking door 25 isprovided through which fuel may be inserted into the furnace, the boilerhaving the usual side walls of which one is indicated at 26. Mountedwithin said furnace is the Stoker grate 27, the form shown being sub-Astantially that of my Patent` No. 1,355,095, in which the individualmembers or grate bars are, operated to advance the fuel from the upperto the lower end thereof. At the lower or discharge end; of the stoker27 is provided an` ash dumping section 28 and a fuel retaining member29jwhich are operated byfmeans of the operating bar 30 provided Y with ahandle 31,.the Stoker being operated by means of the handle 32 Which isconnected with the stoker grate 27 by means of the bar or link 33.

My improved furnace of the type set, forth in my said copendingapplication contemplates the use of an arch or baffle wall 34 which ismounted in close proximity to the front wall 20. In the operation ofthefurnace, the fuel is introduced through the door 25 and the spacebetween thel arch or baffle wall 34 and the front wall 20forms a hopperwhere the fuel collects to b e later propelled Vforwardly anddownwardlyv underthe arch along the grate into the combustion chamberwhere it is consumed. There is thus provided a hopper within the furnaceitself. The coal which lies within the hopper portion is slowly cokedand certain products of distillation are given off which pass eitherupwardly through the duct 35 provided in the arch 34 or downwardlythrough the body of the fuel into the combustion ,chamber above thegrate. Below l the firing door 25 anV opening in the front wall, whichis partially closed by loosely laid brick is shown for instance aty 36,so that fresh air may pass inwardly through the coal in the hopper, someof which may thereupon travel upwardly, and some of which may traveldownwardly as the case may bedepending upon the condition of the fireand the thickness of the fuel. i

My improvement in connection with a furnace ofthe character thusfar'described consists Yin the provision of an additional arch or bafflewall 37 which extends preferably from one side wall to the otherbackwardly of the main arch 34; thus to conduct the products of4distillation which pass through the duct 35 downwardly into the heatedzone' above the fuel;,thus to prevent these products of distillationfrom passing outwardly without being thoroughly combusted.

My invention also contemplates a novel structure for the arch 341-, inthat I provide a hollow cast iron girder 8S which is mounted within theside walls of the furnace, which girder has projections or iianges 39and a flat top 40 so that suitable masonry work of fire resistingcharacteristics may be mounted in place thereon and suitablyheld in-itsal.- lotted position. I preferably use tile, such as the tile 4l, whichmay be supported from the flanges 89 and then built up the remainingparts of the arch with the brick 42. YIn this way I secure a substantialand satisfactory structure for the arch whichhas a long life.

In order to keep the girder 88 at a low enough temperature so as toinsure long life,` I provide means for circulating cooling air throughthe interior thereof and to this end I provide a pipe L3 which extendsfrom the ash pit upwardly into the interior of the girder .and thenprovide a second pipe e3 which leads outwardly from the interior of thegirder at some point higher than the point at which the pipe 43 is andthe free exterior of this pipe 4:3 discharges the heated air from theinterior of the girder preferably into the ZoneV above the fuel hopper.This air assists in the process of combustion. y

It will thus be seen I have provided an improved form of furnaceconstruction having an interior hopper in whch the productsof combustionare conducted through the furnace in such a manner as to insure completecombustion, and it will also be apparent that I have provided an archstructure which is very substantial and capable of long life under theexacting conditions required of .hes of this nature.

In Fir' I show a boiler practically of the same ty f as the one shown inFig. l with the exception that I have, to some extent, modi- 'lied theconstruction and arrangement of the o arches. Inrthis particularillustration,

sonry but is supported by two tubes 45 which are mounted in the sidewalls 0f the furnace and through which av cooling liquid passes. Thearch 44, however, does not extend entirely to the crownl sheet o f theboiler, but is built upwardly a sufficient distance sov as to 'l' YAthrough which t of dis i may pass from the front of this arch to therear thereof to be there deflected downwardly by the second arch 47which is likewise supported by a water carrying pipe 48 suitably mountedwithin the furnace structure and connected with a source of circulatingwater supply;

In Fig. 3 I show a boiler of the return tubular ,type having the sameinternal hopper construction and provided again with two arches, thearch 87 being simi u 4to the arch the forward arch -l-lis made entirelyof ma- 37 of Fig. l and extending entirely across the furnace, beingbuilt arch fashion, as is indicated by the arched portion at e9. Theforward arch 50 occupies approximately the saine space in the furnacethat is. occupied by the arch 4.4 of Fig. 2, but the arch instead ofboing supported by pipes, is built in arch fashion, the arched portionbeing indicated at 5l and a suitable opening e6 being left above the topof the arch to permit the flow of the products of distillationtherethrough. It will be noted that the forward walls of all of theforward arches are inclined backwardly instead lof being vertical, thusto facilitate the downward passage of the fuel in the hopper.

In Fig. l- I show a boiler similar to the one shown in Fig. 3 but Iarrange a sort of grid iron structure consisting of a plurality of pipes52, as more clearly apparent from Figs. t and 5, which pipes at theopposite extremities connect with'suitable water legsA 53 and 54, whichwater legs are joined to and connect with the interior of the boiler 21by pipes 55 and 56 respectively. lThese pipes are connecte-d to theboiler at different levels so as to provide a continuous circulation ofcooling water therethrough, thus to prevent overheating of these pipesor tubes. This composite grid iron structure forms the front baille wall57 the space between the pipes being sufficiently similar so that thefuel within the hopp-er does not fall through these interstices.Baclrwardly of this wall or arch 57, I provide a second arch 37 similarin form to the arch shown in Fig. 3.

In Figs. 6 and 7, I show a further modified form of arch structure, thisbeing illustrated in connection with a fire box boiler such as shown inFigs.' l and 2. In this particular instance the boiler 21 has thedownwardly extending side water legs 58 and 59. Between these two Iconnect two baffle walls, preferably the baffle walls 60 and 61, thebaflle wall 60 extending entirely across the boiler from the water leg58 to the water leg 59 and the same is true of the arch 61. In this waya complete metallic structure is provided. Upwardly of the baffle wall6() there is the opening 52 to permit passage therethrough of theproducts of distillation, the two baffle walls being connected with thewater supply of the interior of the boiler are thus kept in the samerelatively cool condition that the remaining parts of the boiler arekept, thus to prevent deterioration due to the combustion of the fuel. i

In the operation ofthe device, the furnace is suitably provided withfuel and the hopper substantially filled, then as the combustioncontinues, the grate bars are actuated by means of the handle 32 toadvance the fuel, which has already been coked or partially cohed, intothe zone of high heat. After 'the fuel has been completely consumedexcept expected to throw the fuel over the entireI length of such a longgrate. In this manner,

larger units may be operated because of thisv human element and one unitof double capacity may take the place of the two units heretofore usedwith the consequent increase in efficiency. From what has been thusdescribed, my invention will be clear to those skilled in the art.

That I claim as my invention and desire to secure by United StatesLetters Patent is:

l. In a furnace7 a front wall7 an arch spaced from said front wall toprovide a hopper therebetween, a Stoker having a portion eX- tendingforwardly beneath said arch to form the bottom of said hopper, saidarchV having a duct therein leading from the hopper into the spacerearwardly of said arch, means for conducting cooling gas into theinterior of said arch and means for conducting gas from the interior ofsaid arch into said hopper.

2. In a furnace, a front wall, an arch spaced from said front wall toprovide a hopper therebetween, a stoker having a portion eX- tendingforwardly beneath said arch to form the bottom of said hopper, said archhaving a duct therein leading from the hopper into the space rearwardlyof said arch, means for conducting cooling gas into the interior of saidarch and means for conducting gas from the interior of said arch intosaid hopper, and a second arch rearwardly of said first named arch forconducting gas from said duct in a downward path.

3. In a furnace, a front wall, an arch spaced from said wall to form ahopper therebetween, f

a. grate having a portion extending forwardly for conducting air throughthe fuel bed into the hopper above the fuel bed to mix the same with thegas in the hopper prior to its passage into the combustion chamber.

5.V In a furnace having a frontlwall and a fuel feed inlet in said frontwall, a Stoker grate extending rearwardly from said front wall toprovide a support for the fuel in said furnace, means comprising atransverse arch adjacent said front wall forming with said front wall acoking chamber between the fuel inlet and the burning fuel on saidgrate, said arch having ducts leading 4from the upper portion of saidcolring chamber tothe rear side of said arch and a second archrearwardly of said first named arch for directing the gases from saidcoking chamber downwardly over the fuel bed on said grate.

In witness whereof, Ihereunto subscribe my name this 8th day of August,A. D. 1925.

GEORGE A. KOHOUT.

of said arch to form the bottom of said'hopp per, means for conductinggas from the upper portion of said hopper into the space rearwardly ofsaid arch, a second arch rearwardly of said first aforesaid arch fordirecting the gas from said hopper downwardly between said arches, andmeans for conducting a cooling gas from outside said furnace throughsaid first named arch and into said hopper.

4. In a furnace, a front wall, an arch spaced from said wall andextending downwardlyto the no-rmal level of the fuel bed to form ahopper between said front wall and said arch, a fuel support formin abottom for said hopper, means adjacent t e top of said arch forconducting gas arising from the fuel in said

